[s73v3r]

"If I fund a company and it fails, then I don't have any right to sue them for lost "revenue". Right?"

If you're an investor, and you believe that the company was not acting in your interest, then yes, you can sue.

"What is the difference in the case of Kickstarter. They are a crowdfunding platform are they not?"

Shouldn't matter; if you don't put forth a good faith effort to actually do what you set out to do, you should have the crap sued out of you.